For the second year in a row, Pacific Life Insurance topped the list, with nearly a third (32%) of employees reporting low stress, a significant jump from last year's 23.9%.

The list is based on exclusive data from employer-information website PayScale, which surveyed employees in the US who work at companies that appeared on the 2014 Fortune 500 list.

PayScale calculated scores for each company using six criteria: high job satisfaction, low job stress, ability to telecommute, high job meaning, experienced median pay/total cash compensation, and salary delta. We double-weighted pay to emphasize the importance of companies that compensate their employees well.

Job stress was based on a survey that asked employees, "How stressful is your job/work environment?" The higher percentage of employees who responded with "My job is Relaxing" or "Not stressful," the lower the stress. (Read the full methodology here.)